Examine source code of Rustdoc URL auto-redirect

{
  "manifest_version": 2,
  "name": "autodoc-url",
  "version": "1.0",
  "description": "Auto-corrects older rustdoc pages to be `/latest/`.",
  "content_scripts": [
    {
      "matches": [
        "*://*.docs.rs/*"
      ],
      "js": [
        "autodoc-url.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d2fa63c-a1ff-4a28-bcad-ec306ff87806}"
    }
  }
}